Automatic window-lock.



A. N. DAVIS. AUTOMATIC WINDOW LOCK.

APPLICATION FILED JULY 28, 1908.

912,817, Patented Feb. 16, 1909.

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UNITED STATES PATENT oFFmEJ.

ALBERT N. DAVIS, OF NEW YORK, N. Y., ASSIGNOR TO CHARLES R. VOLOKENING,F

' BROOKLYN, NEW YORK.

AUTOMATIC WINDOW-LOCK.

Specification of Letters Patent.

Application filed July 28, 1908.

Patented Feb. 16, 1909.

Serial No. 445,731.

To all whom it may concern:

Be it known that I, ALBERT N. DAVlS, a citizen of the United States, anda resident of the city of New York, borough of Brooklyn, in the countyof Kings and State of New York, have invented a new and ImprovedAutomatic VVindow-Lock, of which the following is a full, clear, andexact description.

My invention relates to locks used upon a Windows, sliding doors andanalogous closure members, my s ecial purpose being to increase the adatabi ity and uses of a lock of this kind by c anges in its structure.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in WlllGll similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a erspective showing my improved lock app ied to an ordinarywindow containing upper and lower sashes; this view showing also a tripfor automatically actuating the lock under certan conditions when thelower window sash is moved to its bottom limit; Fig. 2 is an enlargedcentral section throu h the lock showing the sliding bolt, the dog Forholding the same in a prede termined position, the spring for thrustingthe bolt outwardly when released by said dog, the thumb piece forcontrolling the bolt by hand, and the tripping mechanism controllable byhand for causing the dog to rclease the bolt; and Fig. 3 is afragmentary lan of the lock, showing the same as partly -broken away inorder to exhibit the siding bolt and its immediate connections.

The lower sash is shown at 4, the upper sash at 5, and the jamb at 6.Mounted upon the upper sash 5, are plates 7, 8 each provided with a bolthole 9. Mounted upon the top of the lower sash 4 is a plate 10 havingintegral with it a sleeve 11. The plate 10 is provided with holes 12 forenabling it to be secured in position by aid of screws 13. The sleeve 11is provided with a slot 14. A sliding bolt 15 has a square portion 15and a flattened portion 15 the flattened portion 15 being somewhatnarrower than the square portion 15. Following this idea, the bolt isrovided with a depression 16, as will be un erstood from Fig. 3. Movablymounted Within this depression is a dog 17 having a lug 18 and providedwith a stem 19 of arcuate form, this stem extending through the upperportion of the sleeve 11. The dog 17 is further provided with a trip 20having generally the form of a plate bent substantially into L-shape, aswill be understood from Fig. 2. This trip is provided with a roundedportion 21 upon which it rests, and this rounded portion is adapted tomove slightly in relation to the bottom of the sleeve 1 1.

The portion 15 of the sliding bolt is provided with a lug 22 integralwith it and extending slightly from it in a lateral direction, this lugbeing partially within the path of the lug 18 carried by the dog 17.

The bolt 15 is further provided with a thumb piece 23 rigidly mounted uon it and extending upwardly through the s ot 1 1-. A spiral spring 24is disposed within the casing 11 and engages the bolt 15, tending toforce it to the left, according to F 2. The other end of this springengages the dog 17 at a point just below the stem 19. The pressure ofthis spring normally holds the dog 17 in the position indicated by fulllines in F 2, thereby maintaining the lug 18 in such position as toprevent the lug 22, and consequently the bolt 15, from moving to theleft according to this figure.

A trigger 25, having substantially L-shapc, is pivotally mounted uponthe jamb (S. A guard 26 partially encircles this trigger, and serves asa limiting stop for it and also to protect it from accidental injury.

The operation of my device is as follows: The operator, by grasping thethumb piece 23 and drawing it outwardly or away from the window (to theright according to Fig. 2), while depressing the trip 20 as indicated bydotted lines in Fig. 2, presses the spring and causes the dog 17, underpressure of the spring 24:, to assume the position indicated by fulllines in Fig. 2, so that the lug 18 prcvents the lug 22 from moving tothe left, according to this figure. The bolt 15 is thus restrained andheld in the position indicated in full lines in this -figure. The twosashes 4, 5, or either of them, may now be moved at will. If, however,the upper sash 5 be moved to its upper limit, and the lower sash 4 bemoved to its lower limit, the trip 20 automatically engages the upperinclined surface of the trigger 25, and this turns the trip 1 20 intothe position indicated by the dotted lines in Fig. 2. The lug 18 thusclears the lug 22, and the bolt 15, under the impulse of the compressedspring 24, is forced outwardly, as indicated by dotted lines at the leftof Fig. 2, and extends through the plate 7 thereby locking both sashesfirmly to gether. If, therefore, the upper sash 5 be in its uppermostposition, and the sash 4 be moved to its lowermost position, the windowis locked automatically by the action of the trigger 25. This triggerbeing loosely pivoted within the bracket 26 leans always toward thesashes, and as its surface is'slightly inclined it easily causes thetrigger to rock whenever the sash 4 is moved sufficiently for thispurpose. operator now wishes to raise the sash 4; he depresses the trip20 as indicated by dotted lines in Fig. 2, and, grasping the thumb piece23, draws the bolt in the direction indicated at the right in Fig. 2.The dog 17 now clicks into the position indicated by the full lines in F2, thereby preventing the bolt 15 from moving back under pressure of thespring 24. The operator may now raise the sash 4, and after raising it,may lower it nearly to its bottom limit, without disturbing the bolt 15;in fact, the sash 4 may be moved freely at will into any position exceptthe one representing its lowermost limit of travel. hen, however, it ismoved into its lowermost position, the trip 20 is engaged by the trigger25, and is thrown into the position indicated by the dotted lines inFig. 2, thereby again releasing the bolt 15 and securing the sashestogether. W hen this action takes place-that is to say, when the lug 22reaches its extreme limit to the left--the lug 18 drops downwardly andprevents retrogression of the lug 22. In doing this the bolt 15 islocked in its outermost position and can not be moved to the rightaccording to Fig. 2. The two sashes are thus locked rigidly togetherunder conditions where they can not be separated, except by a personmanipulating the trip 20 so as to raise the dog 17 and thereby liberatethe lug 22, the operator meanwhile grasping the thumb piece 23 andforcing it to the right so as to draw the bolt 15 to the right,according to Fig, 2. It will thus be seen that the bolt 15, when oncethrown into proper position to hold the sashes firmly together, can notbe readily released, except in accordance with the will of the personlocated within the room and having complete control over the device. Aperson outside can not readily manipulate both the trip 20 and the thumbpiece 23 at the same time so as to open the window surreptitiously. Itwill also be noted that the bolt has two extreme positions representingthe limits of its travel and in which it is locked positively.

If the sash 5 be lowered until the plate 8 Suppose, however, that the Ioccupies the position occupied by the plate 7 in Fig. 1, the sameoperations may be repeated, the only difierence being that the sash 4overlaps the sash 5 to a greater distance, so that both sashes, movabletogether as a unit, may be moved up and down within narrow limits.

If it be desired to move the' sash 4 to its lowermost limit .withoutcausing the two sashes to lock together, the operator merely grasps thetrigger 25 and rocks it slightly outward, so that the trip 20 cannotengage it.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A device of the character described, comprising a casing, a slidingbolt mounted therein, a spring engaging said sliding bolt, a dogprovided with a portion engaging said sliding bolt in order to restrainthe latter, said dog being provided with another portion engaged by saidspring and further provided with a trip for moving said dog out ofengagement with said bolt so as to release the latter.

2. The combination of a casing, a bolt movable relatively to the same, adog connected loosely with said casing and having a limited play inrelation to the same, said dog being provided with a member engagingsaid bolt in order to temporarily restrain movements of the latter, saiddog being further provided with a portion projecting from said casingfor the purpose of enabling said dog to be moved in order to disengagesaid bolt, and a spring pressing said dog and said bolt in oppositedirections.

8. The combination of a lock provided with a bolt, a dog for preventingmovements of said bolt, a trip for actuating said dog, and a springengaging said dog and adapted to actuate the same relatively to saidbolt, said spring also engaging said bolt for the purpose of moving thelatter.

4. The combination of a lock provided with a bolt, a thumb piece foractuating said bolt, a dog for holding and releasing said bolt, said dogbeing provided with a projecting member controllable by hand, a springengaging said bolt and said dog for the purpose of actuating said boltand also actuating said dog, said bolt being movable by the oint actionof said thumb piece and said projecting member.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALBERT N. DAVIS.

Vfitnesses EVERARD B. MARSHALL, J. W. HANAFORD.

